The first picture is one of my favourite colts who you can always garantuee is going to be out of his stables when you do the morning feed fun. (which is what he had done in the picture) He is very friendly and playfull.
The second is a cute little weanling who is in for handling. He (i think) always looks over his stall door with this expressions when he hears someone coming.
Then my own racehorse Apache hehe.